The third contact

These two images are a rather complicated composition of four images with various exposures taken near the third contact. The image of chromosphere taken with 1/500 s exposure (left) and the image of Baily's beads taken with 1/1000 s exposure (right) both have underexposed parts with no information. These parts were reconstructed using two images with longer exposures taken several seconds before. This reconstruction has no influence to the correctly exposed parts of images. Images were registered with high accuracy which enabled to enhance fine structure of prominences.
Click on the following reference to display the same image in the maximum quality (815 KB, PNG format).

Date11. 08. 1999
Time10:23:28 - 10:23:48 UT (all used exposures are in this interval)
PlaceFrance, between Amiens and Beauvais, about 100 km northern from Paris.
CoordinateN 49° 38', E 2° 09'
ConditionsThin high clouds
OpticsRefractor Zeiss AS100/1000 mm with teleconverter 1.5×
FilmKodak Elite chrome 200
Exposure1/125 s - 1/1000 s
ProcessingSelective composition of four images, contrast on high frequencies improved
Image processing Miloslav Druckmüller
ScannerNikon LS-2000
SoftwareSofo ACC 5.0 Scientific Image Analyzer with Match II Module (final processing)
PhaseCorr 2.0 Analyzer (rotation estimation for registration of images)
OrientationThe image must be rotated 20.51° clockwise to achieve the standard orientation (N top, E left) in heliocentric coordinate system
Copyright© 1999 Libor Šmíd, © 2004 Miloslav Druckmüller


Miloslav Druckmüller
Institute of Mathematics, Faculty of Mechanical Engineering
Brno University of Technology, Czech Republic
Page last update: 19.3.2007